Visual Studio 2010上的访问冲突

Question

I have a problem in my C++ code, look at this function:

void insere(titem x){
    tlista *aux;
    aux = (tlista*)malloc(sizeof(tlista));
    aux->item = x;
    ultimo->prox = aux;
    ultimo = ultimo->prox;
    aux->prox = NULL;
}

When the line: aux->item = x; is performed, Visual Studio says:

Unhandled exception at 0x53eacafa (msvcr100d.dll) in TP6.exe:

Look at my struct titem:

 struct titem {
      int prioridade;
      string nome;
      int freq;
 };

In Dev-C++ the code works ok! What might case the problem and how do I solve it?

Answer 1

You are using malloc to allocate an memory for an object. That will allocate the memory, but it will not initialize the object. That's a problem for the non-POD members, for example aux->item.nome .

Instead of using malloc you need to use new .

tlista *aux = new tlista;

When you are done with the struct, use delete to dispose of it.

delete aux;

Since you are using C++ you should forget all about malloc and free . Heap allocations are performed with new and delete in C++.